Dinafem Sour Diesel Auto

10/27 - Today is technically day 28 since germination. I would normally wait three more days before doing this update, but enough has changed, I figured it warranted documenting it early. Today I did a solution change to half-strength week 3 guidelines per the Dyna-Gro feed schedule from their website. This gave me a ppm of 740 total, including 170 ppm tap (measured using Hanna Primo .5 conversion). This gives me 570ppm (1.14ec) of nutrients. The solution was changed about four hours prior to their nap time (of four hours in length). Shortly after the lights came back on I noticed this discoloration on her roots (as shown above in picture and video). Both ladies in the video were given the exact same solution at the same time and now show noticeably different ppms (Sour Diesel Auto - 770ppm; Amnesia XXL Auto - 720ppm). I'm not sure why they are exhibiting different reactions to the same solution. She doesn't seem to be showing any other negative effects at this point. Root growth is phenomenal and her vegetation has only accelerated since being topped. Just slightly concerned about what to do with the root issue. I have thought about adding Botanicare Hydroguard since the smaller buckets will run slightly warmer in temp. Once they start drinking more, I will bump them up to 5 gallon buckets, but that's not needed at this time. Any advice, questions, or observations are very welcome. This is my first DWC run and first run with Dyna-Gro. Edit: 10/29 - Added 2ml/gal Botanicare Hydroguard as a precaution regarding her potential root issue. Res temps are mid-seventies, so I'd say it's a safe move and some relatively cheap insurance. Edit: 10/31 - PPMs kept increasing up close to 800 from the original 740. Added pH'd water to dilute right close to 700ppm. Would have diluted more, but that was touching the bottom of the net pot. Removed two main fan leaves that were actively shading new growth nodes. Added second Mars Hydro SP150 and raised both to 18" above canopy.